Compilare: user.cpp: In function ‘void read(char*, bool*)’: user.cpp:34:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(isdigit(c)) v[++v[0]] = c - '0', w[v[0]] = 1; ^ user.cpp:34:51: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(isdigit(c)) v[++v[0]] = c - '0', w[v[0]] = 1; ^ user.cpp:35:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] else v[++v[0]] = '*', w[v[0]] = 0; ^ user.cpp:35:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] else v[++v[0]] = '*', w[v[0]] = 0; ^ user.cpp: In function ‘char nextch()’: user.cpp:10:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^